Ah, Google Glass. Though the venerable headset has a lot of potential, it has yet to become something people want to use all the time. If you're a social media addict, a news junkie, or a productivity pro, though, Google's heads-up computer just got a lot more compelling. Today at I/O, Facebook, Twitter, Tumblr, CNN, Elle, and Evernote pledged to support Glass by releasing official applications - "glassware," as Google calls them.